transformer

transformer

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• Baluns - A complete guide to Baluns and transformers by WK5AJL
  [ Hits: 1387 | Votes: 6 | Rating: 5 ]
• The DC Isolated 1:1 Guanella - The DC Isolated 1:1 Guanella, transmission line transformer by N7ZWY
  [ Hits: 698 | Votes: 0 | Rating: 0 ]
• Switchable MTFT for Wire-Antennas - A switchable Magnetic Transformer for Transmitting for various impedances
  [ Hits: 1215 | Votes: 89 | Rating: 7.98 ]
• 1:49 Transformer - This 1:49 transformer is used with wires any multiple of 1/2 wavelength. This is not a matching network, it's a wideband transformer and it has some advantages compared to LC matching
  [ Hits: 2474 | Votes: 25 | Rating: 5.84 ]
• Antenna Balun - What is an antenna balun, why and when do you need it, type of transformers, impact on SWR and feed line efficiency.
  [ Hits: 1328 | Votes: 1 | Rating: 8 ]
• DIY isolation transformers - Article about isolation transformer construction to perform optimal impedance matching. Winding the FCP isolation transformer, includes interesting table for Winding Turns and Lengths and Core Configurations for T300 T200 T400 toroids
  [ Hits: 317 | Votes: 0 | Rating: 0 ]
• Unun vs Balun - Configurations and differences - If you ever asked if you need an Unun or a Balun this article is for you. The right question should be do I need a feed line choke or an impedance transformer whose output is configured as balanced or as unbalanced. An impedance transformer can be configured as a voltage transformer or as a current transformer.
  [ Hits: 345 | Votes: 3 | Rating: 6.67 ]

• End-Fed 6-40 M Multiband Antenna - This project produces an inexpensive, multiband, end fed HF antenna matchbox, quick and easy to setup. This project creates a trifilar wound, 9:1 UNUN toroid matching transformer. Handles 100W and need an antenna tuner.
  [ Hits: 1996 | Votes: 4 | Rating: 8.25 ]
• Multiband end fed antennas - This is a 200 Watt PEP step up transformer for end fed full and half wave antennas without radials, designed as a 200 Watt PEP
  [ Hits: 2274 | Votes: 9 | Rating: 7.32 ]
• End-Fed antenna for 17 and 12 meters - Article about an end-fed anntenna for the 17 and 12 WARC Bands. 30 meters is not included in this project. This antenna includes a 14 windings unun impedance transformer using a FT-140-43 ferrite toroid, that should be enought for a 100W PEP.
  [ Hits: 541 | Votes: 3 | Rating: 4.33 ]
• Multi-band End-Fed Antenna - An excellent guide to homebrewing multi band end-fed antennas. The article, embed several drawings including diagrams and detailed pictures, illustrating the basic funcionality of end-fed antennas. The author gives some basic hints on how to build a half size antenna for 80 40 to 10 meters and a 6 meter to 40 meter configuration. It is also well described how to build the impedance transformer and the loading coils for lower bands.
  [ Hits: 1105 | Votes: 6 | Rating: 4.5 ]

• End Fed Half Wave Antenna Coupler - A home made end-fed half-wave antenna coupler with antenna lenght calculator and counterpoise calculator based on center frequency. Includes pictures and drawings along to antenna homebrewing instructions with a home made on air wound transformer
  [ Hits: 282 | Votes: 0 | Rating: 0 ]
• EFHW autotransformer comparison - Two different ways to create autotransformer for end fed half wave wire antennas, by using ferrite or air core.
  [ Hits: 525 | Votes: 3 | Rating: 2 ]

• Full Wave Loop Dimensions - This article contains the measurements for building a full wave loop using wire and length of 1/4 Wave Coax Matching Transformer
  [ Hits: 1088 | Votes: 3 | Rating: 7 ]

• Matching with one-twelfth-wavelength feed line - Matching with a half wave or wuarter wave coaxial cable is pretty well known, but an existing 1961 system to do that with two one-twelfth-wavelength transmission lines.
  [ Hits: 541 | Votes: 1 | Rating: 10 ]

• QRP Z-Match Tuner 40-10m - The Z Match is really a basic L Match consisting of a series capcitor and variable shunt inductor, coupled to the antenna using the RF transformer action.
  [ Hits: 1800 | Votes: 0 | Rating: 0 ]

• ZS6BKW Antenna - How to Build a ZS6BKW Antenna, an optimised version of the popular G5RV multiband Antenna, basically a random length dipole with a 450 Ohm ladder line acting as a 1:1 transformer by VK4MDX
  [ Hits: 1749 | Votes: 2 | Rating: 7.5 ]

• Antenna Europe - Antenna Europe is an Lithuanian ham radio HF antenna manufactured specialized in Quad Antennas. Makers of Cubical Quad Antennas, Yagi Antennas, Antenna switches, Transformers and Robinzon Antennas
  [ Hits: 1277 | Votes: 1 | Rating: 1 ]

• FT CALC 1.3 - Ferrite Toroidal Core HF Calculator - This EXCEL Program Worksheet calculates the safe operating conditons for a toroidal transformer operating between 1 and 50 MHz. Manufacturer data for complex permeability, magnetic dimensions, and saturation flux density must be available. Some core types which are commonly used in amateur transmission are included. The program produces limiting winding voltages for linear operation and temperature rise over the range of frequencies and power specified.
  [ Hits: 283 | Votes: 1 | Rating: 2 ]

• Yes, all my Coax Cables are 75 Ohms - CO2KK exposes some myths about using 75-ohm feedline with 50-ohm rigs and show how to build a cotanget transformer
  [ Hits: 1307 | Votes: 3 | Rating: 8.67 ]

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